hmmm, I looked into sendwithus earlier as they are local to me. The twist to my challenge is that I'd like my customers to be able to access their OWN mandrill

hmmm, I looked into sendwithus earlier as they are local to me. The twist to my challenge is that I'd like my customers to be able to access their OWN mandrill/mailchimp/campaign monitor accounts and use the existing templates/workflows they already have. Is there a way this can be done with sendwithus that I might have missed?